Centrifugal chuck



fi- 1947. E. B. Pi-IILLIPS ET AL 2,431,961

CENTRIFUGAL CHUCK 1 Filed 001;. 30, 1944 .2 Sheets-Sheet 1za-negzzzwzu'zzzyw Dec. 2, 1947.

E. B. PHILLIPS ETAL 2,431,961

CENTRIFUGAL CHUCK Filed oci. so, 1944. 2 Sheets-Sheet 2 L ivzesi 251762772176 0 Milan z'eZZerZiz of) v nan paw; 19%

Patented Dec. 2, 1 947 CENTRIFUGAL CHUCK Ernest B. Phillips, Lorain, andNathaniel Berthofi, Elyria, Ohio Application October 30, 1944, SerialNo. 561,032

2 Claims. 1

The present invention relates to new and useful improvements in chucksadapted for light machining operation, sucli as the hand burring,sanding, polishing, etc., of metal parts and has for its primary objectto provide centrifugally actuated means for securing the work in position on the chuck.

More specifically the invention embodies the provision of a plurality ofsteel balls loosely carried in recesses in the sides of the chuck andadapted through centrifugal action to engage and expand a split shellcarried by the chuck so as to exert sufiicient force to frictionallyhold the work on the expanded shell and automatically releasing the workwith the stoppage of the chuck.

A further object of the invention is to provide a device of thischaracter of simple and practical construction, which is eificient andreliable in performance, relatively inexpensive to manufacture andotherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawings forming part hereof, wherein likenumerals refer to like parts throughout, and in which:

Figure 1 is a perspective view showing the assembled chuck.

Figure 2 is a group perspective view of the expansible shell and stopshell enclosing the expansible shell.

Figure 3 is a perspective view of the chuck.

Figure 4 is a longitudinal sectional view through the assembled chuck.

Figure 5 is a transverse sectional view taken substantially on a line5-5 of Figure 4, and

Figure 6 is a fragmentary longitudinal sectional view through theexpansible shell.

Referring now to the drawings in detail wherein for the purpose ofillustration we have disclosed a preferred embodiment of the invention,the numeral 5 designates a substantially cylindrical chuck head formedon a stem 6 by means of which the chuck is attached to the machine.

The chuck 5 is formed adjacent its outer end with a plurality ofradially extending recesses I in which steel balls 8 are looselypositioned.

Mounted on the chuck 5 is an expansible shell 9 having an inner end wallIll provided with an opening II for receiving the stem 6 and securedthereto by a set screw I2. The outer end of the shell 9 is formed with aplurality of longitudinal- 1y extending slots l3 terminating in openingsI4 at the inner ends thereof and forming a plurality of spring fingersl5 at the outer end of the shell.

A stop shell l6 encloses the inner end of the shell 9 and is likewiseformed with an inner end wall I! having an opening I8 for receiving thestem 6 and secured to the stem by a set screw IS. The outer end of thestop shell I 6 terminates inwardly of the outer ends of the expansibleshell 9 whereby to permit expansion of the outer ends of the springfingers l5.

In the operation of the device the work is placed over the expansibleshell 9 at the portion thereof projecting outwardly from the stop shellIS, the outer end of the stop shell l6 limiting the inward movement ofthe work on the shell 9.

When the chuck 5 is rapidly rotated the steel balls 8 will be thrownoutwardly by centrifugal action against the inside of the spring fingersI 5 whereby to cause an expansion thereof for frictional grippingengagement with the inside of the work positioned thereon and thussecurely hold the work in position on the chuck for the light machiningthereof. When the chuck 5 is stopped the centrifugal force produced bythe steel balls will be released thus permitting removal of the workfrom the chuck.

It is believed that the details of construction and manner of use of thedevice will be readily understood from the foregoing without furtherexplanation.

Having thus described the invention, what we claim is:

1. A chuck having a plurality of radial recesses therein, weighted ballsfreely positioned in said recesses, a shell secured to the chuck andhaving a plurality of longitudinally extending slots in one end thereofto provide spring fingers thereon, said spring fingers closing saidrecesses and subjected to the centrifugal force of said balls during therotation of the chuck to expand said fingers, and a stop adjustablysecured on said shell.

2. A chuck having a plurality of radial recesses therein, weighted ballsfreely positioned in said recesses, a shell secured to the chuck andhaving a plurality of longitudinally extending slots in one end thereofto provide spring fingers thereon, said spring fingers closing saidrecesses and. UNITED STATES PATENTS subjected to the centrifugal forceof said ball Number Name Date during the rotation of the chuck to expandsaid 1,464,551 Urquhart Aug, 14, 1923 fingers, and a, stop shelladjustably secured on 5 1,312,628 Gydesen Aug. 12, 1919 said first-namedshell. 1,431,761 schlaupitz Oct. 10, 1922 ERNEST B. PHILLIPS. 2,101,790Cole et a1 Dec. '7, 1937 NATHANIEL BERTHOFF. 2,408,503 Young Oct. 1,1916 REFERENCES CITED 0 FOREIGN PATENTS Number Country Date The foll Owmreferences are of record in the 120:134 Great Britain 1918 file of thispatent:

